Stress - Strain curve for two wires of material A and B are as shown in figure.

(a) Which material in more ductile?
(b) Which material has greater value of young's modulus?
(c) Which of the two is stronger material?
(d) Which material is more brittle?

A body floats in water with 40% of its volume outside water. When the same body floats in oil 60% of its volume, remains outside oil. What is the relative density of the oil?

A light rod of length 2m is suspended horizontally by means of 2 vertical wires of equal lengths tied to its ends. One of the wires is made of steel & is of cross section A₁ = 0.1 cm² & other of brass & is of cross section A₂ = 0.2 cm², find out the position along the rod at which a weight must be suspended to produce
(i) equal stresses in both wires
(ii) equai strains in both wires for steel, y = 20\(\times\)10¹⁰ Nm^-2 & for brass y =10\(\times\)10¹⁰ Nm^-2.

Athin rod of negligible mass and area of cross sectional 4\(\times\)10^-6m2, suspended vertically from one end has a length of 0.5 at 100°C the rod is cooled at 0⁰C, but prevented from contracting by attaching a mass at lower end. Find
(i) mass
(ii) the energy stored in rod. Given for rod, y =1011 Nm^-2, coefficient of linear expansion = 10^-5 k^-1 & g = 10 ms^-2.